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Finding the Fourth Proportional to 718.31, 991.19 and 438.41

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Solution

The fourth proportional to 718.31, 991.19 and 438.41 is: 604.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.31 : 991.19 = 438.41 : x
  2. Step 2: Convert to fraction form
    718.31/991.19 = 438.41/x
  3. Step 3: Cross multiply
    718.31x = 991.19 × 438.41
  4. Step 4: Simplify right side
    718.31x = 434,551.18
  5. Step 5: Solve for x
    x = 434,551.18/718.31
  6. Step 6: Final answer
    x = 604.96

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.